I am in the planning stages of my outdoor kitchen that will be constructed on a new deck that sits up off the ground about 3'. I would like to run my gas and water lines to my outdoor kitchen above grade connected to the bottom of the joists in some fashion. Are there any issues with running gas in this manner? Trenching them into the ground will be difficult to do. I plan to slope the water lines to enable me to drain them in the winter, but I can do without the sink for the winter months.